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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804c2279d2918e490f1dd6c05af4ff415f9aa61fde3293caa88597f58ad389cc' 
  AND token = 'lqs0jOElyr4zuhwvxL9FQXD1SHRK4IBsQv7yqSAqd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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