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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029bc1986d3b172040e3139d07188db4c3ea4f614adf8b055ac93112a6fa1fc4' 
  AND token = 'yqqc6uColeVKhJrxXbA7En9IA/zn8n+JkM/RN05sXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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