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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b476470bceee04d2b08e0cb54cf912f61f7ea327fb53eafe62bdc3d9dd028de' 
  AND token = 'g7gVt2W9KkJiSPJdahcIUtmNVlpypp2VlxzmYjjVB8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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