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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59212f89d081f94ac728b097d37c254b64cf4be06c72290ed21bc9cc95fe21ae' 
  AND token = 'HP5lImRVzk3ad3k4rFR03TAsBXkOWPdlSxvoV+GjxRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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