SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c8c1154e0e97f829b0e8930d3e688f3bb316dd4b5b9fbd89238e052f6d30eb' 
  AND token = 'TYZwQbHOgZXwxluWlj3754l7fZB6Y6qF3vJq8WwPZJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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