SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7240d9c0d53ea0b48b24db617af7deee7ca8fdc8d1852fdd6c49f7bebe122443' 
  AND token = 'wjJtBGZ1jUJExY6PR8jrz+HNFndPmshNQavEMKv/FZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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