SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0199f43a0a20c4e37a41bb1360110c581c041fbf6b9568678a861e9ae5a2766d' 
  AND token = 'ZluUxW1TxeunjNmb4ssNUr+swW+BVV2JiYrOXNGZlYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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