SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4499d2d1c63281db739a08841bfe76223447174a4acf8a0f732e3905ec675d7d' 
  AND token = 'Z6GVqOfUTlWmwITEx3bAzddJ1YD2DnWXjnB9tY3QYXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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