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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdae8fb0ee03a1490a6774ff0115beb537559fa10d125eab7bde1dd5430d6b8' 
  AND token = 'sbJSarE4K9uQDjRjpveeCeoXCGP8X9I5/4fTcKiBICc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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