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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ede97d11f5b2b2e97faf5c63d0becc1c6803f3b119ab1754389196b36d0ef1d' 
  AND token = '9HANXaUi4sKRTQaCxZJQaUYaUK9n5Lrw0m60bGDt3/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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