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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276c37dbd6d265a372986754c7eaf96d77ad1278d62c27d5a61143e50680537f' 
  AND token = 'xWg41ThwfFm1uIfnBeaBzhnj8dQgOMcTzf5mAsEyBoI=' 
  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