Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f7535fa53ba0e27d4e6c019b6f66df4a71d9fa32f45b2f8959e390fad43c5e' 
  AND token = '1MnqtxgBQp6kyzryViMS7dXHydtry6j1AlhKGKErqMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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