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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8258062946a43a3c8e69a9c9de9bc6f1e560ee905764c04ef5aa4b166d3d446f' 
  AND token = 'Bamq6TZdDRxkHX7zYbv5zyvciT7yHNqKOQysh/Ebms0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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