SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96616512c515e541d3ad0224005bbf37894afaf53b1d677f69023f6f2191f8f4' 
  AND token = 'DUlIDmnCVKLYvUketHdC0s+blzEQnuczgA/4Jm4YuWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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