SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219426c41d2378ec8ac276f34ad6d4f16092d7b439afb780702af6768412dacd' 
  AND token = 'ZYKFJEiVspKPigROjSRCxs/p/9TdZ3fCw5QmLQX+O2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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