SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01629ca0956b21cd4c1a082e4d873f34afec76401f42985c3058b6a70d76684f' 
  AND token = 'GkGgIkD1HvyoiAn2OXwKKNKgObMaK6BzyQBgbZNVdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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