I had a rescue come in with mites once.
I got some type of mite spray at the pet shop. Until you can pick something up or wait for an order to be shipped, here are a couple of things that can help.

Soak your snake daily for 30 mins. Use a very mild soap, like Dawn. Wash the snake off after the soak. Wash out the tub once or twice a day. Use only newsprint or paper towels for substrate. Change it daily if not twice a day. Wash all bowls and hides along with the tub.
Place a large enough bowl so the snake can soak it self.
I also placed baby oil around the face, eyes and hit pits. While your snake soaks, the mites will move toward the head as it holds it above the water.

She didnt have a bad case and they were knocked out pretty quick.

Good luck.