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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2246d998a2d834da1e3df35a9b63a4f2b93b81fd9295d4042e5f18657aad5f25' 
  AND token = '4e0OUdLkqAqKE3X32OrhtXXwbTnmu14Lo9w4NeQVinI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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