Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff37d44949916cfa3041a931e2aa8f03cafa21d7e16801e6b205dceb7586928f' 
  AND token = 'TgUNRPQh9zbNtqHLdNSZrtaTqR/6CpRJWaIjtzEMLuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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