SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965103ce21a47548ee73ed20e72e59b773454792b766085aca23f353f4427057' 
  AND token = 'zDX/vL2R5vdtNhbHgA1KuWZ9F2FO1yi9zCBguKcY2qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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