SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f661c4cd672eb8d14acbe8cb4e0870ff59aa366fd385ae63c30657b2e16966' 
  AND token = 'qppwVjbNBnkgGsBXTBYq9GGtXqOSgrj2m23PvoKl1eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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