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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77750a4a72966481e711d00bdac7ec4b9677e421e74d4193a55dd2050e0e4c4' 
  AND token = 'lllCZ2+/tT7Rfgif7zUmi6dEUasIYLHQLK8RPHOmfMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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