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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b5c36d09179e9f7c0ab0e864a6dd8e5daad1a947df901c58ff0554d606ceb1' 
  AND token = 'wOOGyKq/I0htrL1lJIO7TEwWDSzp+oWU7iJc/fiF38o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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