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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb8469a1d27b5b64a0d03322bfc03dec42d1b8204394fffd943af6f4d3036db' 
  AND token = '5zdWWNf0JiekmAAZ4Q0HFfxjaE55T+7ob3o7CRMruzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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