SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2945fa9e8a344b63e4e11708d34535922466c4f63987590d6b79e4e8e67074ef' 
  AND token = 'ZDuxhXKrJZCdxJBl3ztEvXWqwqO4/90Ag7k4ViYUFhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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