SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab77c957cb69d8a66fbd242f03e7c941f4726c8fb00a7e88dd19ec27c7ab5118' 
  AND token = 'ATdJnVynVJ/qjFDZpZY0h13L1jaddMp7zB4BthxToHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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