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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289b1e6bfacce6d1cdad32a4d17ef2685b8b471a199184f511bf3cc3844bfc24' 
  AND token = '0Q5MOmLuWQ+7ACSEZ09xNNmEhb6OGh6chIAjmQ9An9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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