Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0da6676f251879daca4bc8110dbf56a0750aba50a8cb4d54493b994a69ae6d' 
  AND token = 'piKVB0edmE+UBrc9QQ/hOz7W06QPqcOPYeDCi0Ncqlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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