Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4314cfc59e88c3318ceddbd1c76ddff8bef553821aab71ed155b90f2794664a' 
  AND token = 'XzGh5MPWf29KXBNcSYephtEJSBKOwXMpMbv8CBzMso0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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