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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cd4429226becf08d1d141354b90fad89eee9cc27d26b772785aa5600e5afe7' 
  AND token = 'jn+NtoMArgwm+935K6D/DxS1nKFrvkPnkuvLk8hChLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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