SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660a1368f96e00d8461ef401211cd4fe6491fb1eda8429d5df17fe40fe02ea16' 
  AND token = '6qYJX+Z/vrVhM32BP46CzZhNF3naCqUtmG+xfPkgKhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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