Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3444d015d2916b135fa53bb3fbec959388d09dca68c87587ff7c454ad85d03a' 
  AND token = 'faDcXM+Xt2mUaL3a3wJkrTNvNEucxwYq/REENrgtNKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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