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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32908fcf1fd96978b9355560a2bd5a3cc99ebc4613256cc037675ea99038425a' 
  AND token = 'pea+TxvSdLqTCVLi34TucPrtZROqHRcteh3Kfqz32P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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