Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff028903de5f97e84a3b08ec494f7a933f03e78171a590ef562dfc82a56a7ab3' 
  AND token = 'w9zaq0c21k/78VwvP7f3CXAzfbvJOob0LlbxcUZMpJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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