Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6982b303566156090925a0eb2bc3746da494ffb9976abdb44e5ecb8aaf8976b' 
  AND token = 'D6i/pRcXaYxXPmssCzqt4984XKD+7T7i8go3odYbW40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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