SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d67b183dd6f91a4d886258ca466861a53fcd52d4b4a5a9d585412a3dbffd36' 
  AND token = 'DnzK7VH6VbVRvU6eMJj0+7wDmJ0Ge+tLy2NrZRq7J9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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