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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920fd80be410f614d8c2849b94b9f1016be69b36890291df72f513c4a85ceb7c' 
  AND token = '6fbP9qukVyPA4EsNkLqth7Tuepj8UQFJn+QTo8j4I4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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