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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae809128bafafa8df2b67780ec19d557e84a9a4f125f815b3e94901439e12a6f' 
  AND token = '9Nwc6UP8Dtu4jZK5vm8iOCfmRJPFayywEidTJbKd43U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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