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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24aa30686b5ba7fea01a96f33eb9434193d600b568afd9f9a788d72c64821cd3' 
  AND token = 'dNwmyhjv3r+l+HdFvzXzI+xAV8P8Hm3qfcAkGjELwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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