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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7757c95c95809eab8680b9bc7564ee4c0f34b3c79dc22c60f34374b7e92d1566' 
  AND token = 'Rf9SFuUNQQ/EqxWdgbqVj5XLRS2r00SF772IQaz0QUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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