SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7267e5cb993978d510315ade732fe2880285f362b600be1d2bc2e91deb8d9928' 
  AND token = 'bWc27KiufFxAVUZF73SwgTK+zIjWDY/hqkPo+/y6RPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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