SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d030fdf4e23c8fcc41b791813917c480e70698a304438f7856e1a288d096f75' 
  AND token = 'P0M6s+y35rtagcDsDWuDAcAjYqaQucFjlSzvE6GjLck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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