SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed7918c9f9274067d65c49a748c89b579bfbe6aff220bd6fb5e0b4be4f9fba2' 
  AND token = 'ViPZo5nY2+7/Kl0wrgsuu+r+ZBrq3CSOMkeDU8LjI6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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