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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bb9de659c178560106c2ac7968c64fe54017246bfd841088367d0df1e71c37' 
  AND token = 'ww2sUc0yCtGd2Ms4thrdckxqnbY27tgD9RcG6tTQ4GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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