SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d205ff4fbb12f58a65ba8631cabf9f546108a7d95386b1c48152fbfb44cf326' 
  AND token = 'D0viBeKySYz1+nL+lyycjhP/xkDcpZjvYAxF/tiAFXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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