SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae0cd04316d9cb547f25b69da570cf05f03ee1f2d2801af1b2785af9ce3ef63' 
  AND token = '/5dOZprmUn+sjEwqYNJH/1qlz/Gqgb+N8VDWS7trVgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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