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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86da9370200d22094a3dabc3428b9a0942cff71cfe83a8b0decac9c81adb2e3f' 
  AND token = 'CfoXQ33aUIOXS1+lUMc9AI/rMRxtIIsU/xl3dUMQpo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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