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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f90ee8365c95c396df53c1f7eaf960e8af7533e73c22218bd6d30a42be8d739' 
  AND token = 'jYmTuoFipbNVfEDOrd5GNSQenrhjpjPz0HlH8Rbf7Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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