SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da5652b333866b18a285c271d29ecf8e9c1eaf57da605665e3d948030ccb4ea' 
  AND token = 'd/DWM9KYKpoxe0ig+wLIKha0StBVYz+p52W5Z5bCqvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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