SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ecff4f282bc82370cf4d08bfe605ff266997b1343e8d4a26413af20e423936' 
  AND token = 'GOhXEwZa3h99mpXkWpCVaR+quLhL/Gxle5fZNzSysMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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