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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33a203b728b26adc8cd6a69e8363c0b8a7d931b60da03bbc410cf8d5c76fc25' 
  AND token = '3aWqKsJ/mhs0Y8udtV6oSLYEbYoJVlioqNfkQoZi3Vw=' 
  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