SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6385483e41a2e953daa59e210ed477f7ef2c6268ba1d8d49acd70fbfc6468c' 
  AND token = 'wLPcBgDbw9DRLQRTcgo8YQPozKyt/tjwDbsnhrji9KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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