I have this issue, but find it mainly arises with modern coated keys and stuffy heated venues.
It's frustrating because it will turn an otherwise easy performance into a struggle. Once the sweat builds up on the keys it forces you to tighten up to alleviate constant slips. Basically you end up playing with smaller motions and less relaxation than you normally would. This inevitably limits expression and can also introduce memory problems if you're reliant on muscle memory.
In my experience alcohol wipes and a hand towel don't really work. By far the best solution is performing on your own terms with pianos you already like. That's a real luxury though. So perhaps it's better to just accept that occasionally things will go horribly, and when that happens, look forward to moving on to a different venue

If it's a problem with a practice instrument, try to find a different one to use that has ivories, or at least non-glossy keys. Also open a window.