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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff5f4cf313a47a9052fca243e8a730978d6ae1ab4c9f1f11cacafa22c1ad712' 
  AND token = 'iul7nqfu0fdgXHDbrNbsVRE/0Ki3VQfpug5qAtOG5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}