SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552528d0180b79c9c5d60b77ea65de19245c84f7990802d7dc110d3d9ef39a9f' 
  AND token = 'ysfBXyfEZXGSugOrUA+HgzBYLVA1WD/K/yDibra3mns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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