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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc04fbc7d477ec04e7c2957faf2fafc1a900f496cb237437ff6a3bfd8e94cf99' 
  AND token = 'sH09Mw0957621yZF+QcJLWVjpxinXN+Un2l6+sXLQV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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