SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b0c0d6c1c71e9dbdb7c4355b3f64f4a24f7dd0a537e82b8fc72c620e93f52e' 
  AND token = 'y2hjLFS+B4HFMYKgZwDVOsvXMEy8kKo/LlHo5Ra8CAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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