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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523f555a586c9b23aea444d815359d7b7ad17d6b19eb76d9e75b16774e183908' 
  AND token = 'gYKH8dE6Bww2ep2XRtr5jC+/pR6RDHHKeytS3b1iojU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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