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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37f711591b8ba01375c358b3b86201c92e4605a555f1337a5407a3267ed6ce0' 
  AND token = '6A9v/WAe4dyFwvwLfKE08xiRUYWa1IN9uiWIBElHvfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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