SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a042a02873721ba8b9e6afcd3a21add3f7b7090d455b6aed4abf9ed45efa838' 
  AND token = 'wq/RYi7vVsVzI/W2hNMKViFsTYCwjmspNxAWpWuVICY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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