Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397bbc91032692c48c14143fff893c202cea98ed7b5b601ee9f3edea0f999639' 
  AND token = 'ypeMJ98SZ3lfH1vk2hWHUaqssbwZBO1fJrBfTNQyzFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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