SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047820319bfd4c8a6658d1bf55c27d3abbb4ae9caa2a6a6142e0731efd3a5589' 
  AND token = 'VTscEOPwsqO8YT0KBNnwssaynI/fXqglF0VpjqXKv+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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