SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd56dd2d5be30f77c9b6f9d0b8aac9f02d344fd548bb09ed1c59207dd171b75' 
  AND token = 'givLnVBIbz+p3MIZ/sTKinrjT59E5uKKmHDYrJQTkDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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