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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a87a569489243f096f8ba4b7cbfd5ffa98bb8253f3f894c12e2c02cbc49e38' 
  AND token = 'PnIsYCddZoKGxrI1btgNm0RLedIapRHao8Wga9va/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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