SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac7a9c72d940dfbb5aa4ce97bcb7ca8fbd44bed883fecf6aa1b9eeaf7efd015' 
  AND token = '39yJiscqZVLtKpXqV+q5WloBnZVm+1xY4jg3VOu/ekw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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