SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aebae8a34b47496ba5074d7dd1333442c6c1441d1f3e8b48d7d7644747152b1' 
  AND token = 'qNBSh5UX6m7/aHrgKW+jyKJQrfwM9xVZn5mYOFGHMI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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