SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc7113169aab4321e1a3662ee29de23391f99237a2a45cb5b354284123e1cf0' 
  AND token = 'OWxs/IGqS75T66hVPaPFrBnrmxDZ8+wBXt+ax/ZVO6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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