SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3739222028b4f966a6a332041f7928a53584038dc0f3c4c4f3628af5683d425e' 
  AND token = 'Z+ESIMBryI2Ky9KOm2E4lRNM52zX+x8iEmFMUIejV7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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