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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f4e3eafea151390cae9784e141560b9429030e0636994262c4386b6a6c4be6' 
  AND token = 'uygTy+GURaZQyY7e2ZJSz2Xai+4iWFqod7WBMzFOvuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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