SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96407c8ef8baddd8e353439be07be3fd5a836bbf10d2f282c998ea92db1670a6' 
  AND token = 'wRq+8GAEGWPUScDYzQV6m0KV9q/xL7CGfYKAgwkXTHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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