SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116a51d4e35e4b7b07636d71620c41e1a5f46083c927d0eeec56980ff1ab481f' 
  AND token = 'A0dAwSJZW6vYYgnK5tpQhYCThZlQGzhB2UNvdZU8kac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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