Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1226a5bf420c785234b540db26d7ccae42c3284666779cb59d10a8418b349133' 
  AND token = '9ebS+XhSII88IX/1Sa0npALkD7VmLJ6W5aoavnzS41Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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