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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebbbd9394da9f87d21d8608d1586a82c8ad396c7b8f296ec8e7b616163bcba3' 
  AND token = 'p2EfGus0UTJHkNLf5nM06mORLDL/rXg7cnvaVwS1KzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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