SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eb8ebe17f2dfcb28a9d6b6384fdee5950294dc5339e96921c5f44860c03d27' 
  AND token = 'hG+JE+kg4go6MO0NJ1jzCllZF+TReCF4WHDCBpTX6wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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