SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e1b04c6f2682d6d8e84a8f3ada23e9865529505db176b27eb64407d55a6de7' 
  AND token = 'Pai66oJMNxJ6KSBYqGwwj9vfKfgTiakTzncFPjTVTmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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