SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b63113d3bcb64c4b95d99357288b3cfe33210653d56241dcb1a0b7f56d957d4' 
  AND token = 'rQgf1BcU0vgsZKQOjNbyC8TUjnzRKUg/HM/bP97l0HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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