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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fcf1519069089e76739fb409c37439054f655e8d12caf5e3c601c5a7ffd1f6' 
  AND token = 'rivFQ/8hFkb1WdBm2tQqK9gxSwmGh4npvkTvy6VRego=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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