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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d35a808affc60b6418a4cbcb682486b11dc7ee0eb35adb0ee82450cc14b943' 
  AND token = 'mXGWz70ABivaX/kK9iCK2KUXe/Mzc0QEAGHXD7D5jTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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