SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014cf40e2d9cd698e2c4ff20ba590c3d067bad8e69cad75e326d3fd8e8c55d37' 
  AND token = 'yBqZhupU2BGGVt5m4i1MuWzJ+w460dn9aCxpluV/eLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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