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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc491f0a7bc1501dd72ce3a5aade184e0056086d25c701c52c1fa3de2a88a26d' 
  AND token = 'FTLdDwbk9ddw9RmCzVbujtd3d8H8gUjv1hw7zhqsQEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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