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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe47dc11d58fa1eac11565bc523c67e43e064ad6ad205a4e1469c2ade579534' 
  AND token = 'z8m0PS5sih9Zj4Hai4c5SGn3oa0qnyJgJgSEVCAM8iU=' 
  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