SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9077d2f6a47d2196c8fc1b8b3e186fd0564fd625bf33b15c4c96d50f517091c' 
  AND token = 'NeYg/3Hsdr/hsok/0RT1szZyCqxSZyYllHgoKCw/vKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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