SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7062c977f191efda98a8f9887c6f7a939358e3addb12183b974c45b7c008e2' 
  AND token = 'TMhgGzVY2q0h4oLwyDLXW1Z3/UHgNrYnb5MjQLIPlZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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