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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48f831e386190ca68cae707706df47fac46b8ae5d2e78d2a696d27c685951a1' 
  AND token = '4SurefPuE0XMX9BZ2bkMiHndbcUdKVaPgxGOqc93Ahw=' 
  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