Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31de2449ab3c79efb0ee4e1dfe568da7b664fb4efed1a4ed8f6146a6cb1de4da' 
  AND token = '0tYh7P8HjzZWLIDML+hHWf1mnooiSes3TMNXon5TJiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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