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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67454300bdbfd2cd40623adb3a57c76f66a5e43644ea057bda7ad4139b30f71c' 
  AND token = '7WXGgSnW2aHy7DiWnsUvdUHZ2N+nL8QEToHQMNJAkWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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