SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3566572563004771d43422f8feff19665cfc4312e0b2f96b278308fce21a70' 
  AND token = 'smzqo+DTCm+r6nXGK77xoIYsjQL2oWV1DbkrJZUxGGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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