SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7018fb709acac167b2e07150cd16a8f9bb6f3a93ac32113a55de4964308354' 
  AND token = 'NniJzqWqrnZYxlhKGjUgUQN7kKh2J3jLc/gUf+Cdd1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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