SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c44088f2f99de058fa52b4d3f94e16dbe9d033578e83613d3e39747f36e7c3d' 
  AND token = 'KVaNdpUTKg1GsmLur1xfRYZZuttsUx+qqbrGZlP/FBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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