SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d60a961f4a59adb4bbf49a0cda73911b6b3a993f93133f154dc61851f622b50' 
  AND token = 'Wsqgk/+M5yilbhzlpFmMeHjJOqzAiIwPnkoB7dfUNZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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