The cat is most likely to harm the snakes, so it's the snakes you will lose instead of the cat becoming injured.
Check the entire room the escaped in, and keep the door closed in case they are still in the room so they will not escape from the room. Check in every small and warm place. Everywhere. Even the places you don't expect them to fit into/be in. Snakes like to crunch themselves in small places so you are more likely to find them in small places where you think they cannot fit into. Trust me, they can. Good luck, hope you find them.