SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb81abc33c84aac0b6b2aa9c12025b4104f50bc78d762e9fa22b372dff83b47' 
  AND token = 'ApGBcUAZUe6Jh9GUl/YGxyAw9nPrZTFtzcojLHlk+JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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