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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba57937f1ba1c50b3fbcc8a520325d2f4c9e5407aa22ad153587b41d4cba868f' 
  AND token = 'uwtNX+9pRdVTuyBkr6W2fo3TZx7Lq4ldpku9ZogyHrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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