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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea1afd8c668585d7eaa4df6beb4f17e6beffa443ed620063dddf2f09d40ac2' 
  AND token = 'MurpKM17bX+q5VdVDL3ZE3/4EaSsqKVTVyY/BnHvuX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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