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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d768cd7f7a37d1d0509aa3e5eb461447c0a650ce94969b59e32de96890db01' 
  AND token = 'xgnIHifCFqeTdgLv8qr33NnEh9hROnkd5tc22IRdk+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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