SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7dba1fae063afc60403a6115d0f9e05b07b6513c38cf8dd367ed6492a5eef7' 
  AND token = 'F2QYA72kzVyKPv7/Wds4HJUYw0xvl88QqZKnC6OlHDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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