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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e1da55f45142e76880a4b90d54c69ca2472239d4adb7792d72e6f00117f4dc' 
  AND token = 'w3RH4JQCv9iwmXfd41yxYnwhd468XeubE1jeXYTS3os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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