Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa52ee81219306637808d4c28e88076ebaf1193faea10a717679b4b487beaa91' 
  AND token = 'c55OyvqdUvS6WXHC4+BKJm2hobKSfZtSQZu3A1zrZng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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