SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f4d69b9af3328d6c765660894b7f4743cab78381ba5bfd5603bb6248653511' 
  AND token = '8DLOWr5PO9SYwr5MwMd9OVxFKgWVc/HSVxXO3GZQMF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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