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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae67a97de0123b7421b9170bb2d457c1d06cdbd44873bece2d87f2778a8f238' 
  AND token = '0lokZWPVRDBtO5lpzX2cjdY468Z3qNL6VMsLt69Bano=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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