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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce8e3ffeaa6cd53ce661ad1f6de4c9fd9546bc3b911aab63ebed4f76442ad1d' 
  AND token = '0v/yDZ55p2qFSLcbV9SitDAXsWV8AnXtgXWuxSQs2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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