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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f8e444357d48d827545f89a4c6fafc9a8cabfd5a4a8dabd515351cea6268b8' 
  AND token = 'jOkLpVDRnjC08sivZgIqidkyrEbqUC0BMjBB5/UQrJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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