Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e9a7959e7b884a3a97438c67cff6295524de6c9eab683e3d5a8676e4b83401' 
  AND token = '9/PuLA6+6z8EMXFUfv5sb59ozwu4SCJV2prcZRiKog4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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