SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72302650711bed65cb971e19f78d0f1336fdba94933894a4c26352bc7f504bb3' 
  AND token = 'H77PmJUeuRmnc5hsXSIj2S3cPQVFz+UUgB3QvKX3Hb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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