SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683376f499f6f789ebb03241a1f1136d058bf3da1826a5729e22796640ff9495' 
  AND token = 'Kquy6YEpj+DxtHbGO0kHD8VRKmTKQeQYx/kmpX/PQ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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