SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9299dd3ff55c3dd96f1e6b64c20da55fa16469487406aca1af46264ebc531b6e' 
  AND token = 'MmTTz1CTrgq9koRiSLg3gIth/WnTFY1td/Or2c0TkSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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