SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ffd39d7bf579e5f529bb8588e50cbc64701d349747de4729b8899cb0f74469' 
  AND token = 'cEop/lHPPQGoxVVoO3LaCtnCJF/q0H/LFhQljY2QrjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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