SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24438020c9d5e43fbd9ceba26f0f967e6e7287ae4d9939619f7c8266e18f4a4b' 
  AND token = 'mpwKob+OjshnFYzhHzWZixwBKV8OAjhk78Jfg9m9U7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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