SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbe2656ced53af79e81b76230b7ae868351ba5d1d031821f026d3e2ffc4105c' 
  AND token = 'adt/qoqm3uKZXzlS7BVNlE0uCsKvGdSlCJ+mdE8sZVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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