That doesn't look like a scratch (& snake scales are pretty tough), it looks more like a bite to me, but cannot tell how deep (or serious) from online photos.
Clean it up with a bit of water, dry then apply some antiseptic ointment that is safe for snakes: Betadine (povidone-iodine), a bit of Neosporin (never the pain relief
version), Vetericyn (better option, water based topical made for snake use- Petco carries it). If it's bleeding alot or seems to get infected, by all means see the vet.
But for a small wound without complication, I'd treat at home for right now, as I've described above.
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