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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7fb3357847a553a4a14041655ac8adaf765f869fb3635b93cdc8ea8d2ce2da' 
  AND token = 'EN73iRIsaGzsXO9KeBXeUBrLnyubnqdm8h2ZCSoSUo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables