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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5ded4d3e42420ba1464ee42401caeaf70c50f7619bbda7e3574b9083107e55' 
  AND token = 'iWl1tz0NVta6MTXaC1xJE+Bh3g+FKR5oN5fbvAWxAZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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