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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3d31b338a4bb46cede0a414d0e75c8425f137ba4732de0c07a0748713fec0f' 
  AND token = '7Ut6FLYuYXlpus2g6kXjrTVBTOnP2XUOuWYY4TZ1kc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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