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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20b5cf834fea3f82f3559f10efa188180b99e161e21a4489b47fd58c4f1d07f' 
  AND token = 'dHlfx2bWXNCexxswmLrCPbiZIvB+ABzkiZuAPYissjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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